drafting vs erection

drafting

noun
  • The act or process of producing a technical drawing, or draft. 

  • A method of preparing fibers for weaving. 

  • The practice among ground vehicle drivers or cyclists of following in a close line to reduce wind resistance. 

  • A profession, usually related to making technical drawings for architecture, engineering, or manufacturing. 

erection

noun
  • The act of building or putting up or together of something. 

  • The state or quality of being erect from engorgement with blood. 

  • A penis or clitoris that is erect. 

  • The physiological process by which erectile tissue, such as a penis or clitoris, becomes erect by being engorged with blood. 

  • Formal approval and official establishment of an institution such as a society or a monastery by higher church authorities. 

  • Anything erected or built. 

How often have the words drafting and erection occurred in a corpus of books? (source: Google Ngram Viewer )